NEED INFO! 383bb PLEASE

I recently bought a 383bb I'm putting in a 74 Barracuda. It's something I've wanted to do all my life, building the car and engine. There's the kicker I know about as much as neurosurgery as I do building an engine, "and I'm not a neurosurgeon". So I found the engine then I found the car. Well the car is sitting for now and the engine is first. About the engine, I've researched the hell out of it and so far I know it is a 383bb, it was manufactured in 71 on the noon shift, I am having a hell of a time figuring out if it is a "B" or an "RB", I read that all "RB's" are hemis, keep in mind everything I've said so far is just things I've read besides the 71 and 383bb, those I'm sure of, but as far as all RB's being hemis I don't know. I "think" the b's are short stroke and the rb's are long, but again I'm not sure. I've found the numbers 2468130-4, 3-19-71, g383-e and 6-25 all on the engine block. If anyone knows anything about all this please let me know. By the way thanks, and I'm sure you'll all be hearing a whole lot from me. thanks again, bird p.s I also found the number 4 all by itself the 2468130-4 is in the casting along with the clock symbol, and the g383-e with 6-25 were under it and it was located in front of the block right behind the distributor.